I don't think I will magnetize Ultramarines.
It is cool, but I have figures and don't really need to save them. I plan on building all options for every squad.
Example.....
I will have x3 devastators, therefore I will have x4 of each heavy weapon (Heavy Bolter, Multi Melta, Missile Launcher, Lascannon, Plasma Cannon) modeled up. Why do this? Because I like to have options
another example...
The 6 tacticals will have a
LC,
HB and
ML along with
PG,
MG, flamer. Sgts will have
PW,
PF, and bolter variants. Seems like waste, but not to me.